Injector



(Model.)

' W. T. MESSINGER.

INJECTOR.

UNITED STATESv PATENT AOFFICE,

wILILIAM T. MESSINGER, oF CAMBRIDGE, MASSACHUSETTS.

INJ ECTO R.

SPECIFICATION forming part of Letters Patent No.350,545, dated October 12., 1886. Application tiled September' 7,1885. Serial No. 176,386. (Model.)

To @ZZ whom; t may concern:

Be it known that I, WILLIAM T. MEssINGER, of Cambridge, county of Middlesex, State of Massachusetts, have invented an Improvement in Injectors, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention relating to injectors his embodied in an injector of the class shown in Letters Patent No. 281,385, dated July 17, 1883, and N o. 302,273, dated July 22, 1881, the injector containing three nozzles, the iirst and third, or rearniost and foremost, of which may be placed in communication with a steam-inlet passage or chamber, and the intermediate one of which nozzles communicates at its base with a water-inlet chamber.

The injector is shown and will be described as standing in a verticall position, receiving steam at its upper end and delivering the stream of liquid from its lower end.

The invention consists, mainly, in the novel construction of the valves or devices controlling the admission of steam tothe first and third nozzles, these devicesoperating to admit steam to the iirst nozzle for a short period of time before-it is admitted to the third nozzle in starting the injector, as in the patents referred to.

The injector forming the subject of the presentinvention, like those shown in the said patents, has a piece or casting constituting the steam-chamber, connected by an intermediate or connecting piece and coupling-nut with the piece or casting which contains the water-inlet chamber, the second nozzle and passages leading from the steam-chamber to the base of the third nozzle, which is in a piece or casting connected with the one containing the second nozzle. As shown in the said patents, the tips of the second and third nozzles project beyond the main portion of the castings in which they are formed, and are thus liable to become damaged in handling the pieces before they are put together, and one feature of the present invention consists in making the said f nozzles wholly within the castings of which they form a part, thus protecting them from damage, and also making the injector Inore compact. The first nozzle is connected with the casting containing the second nozzle, and inthe present invention'the piece which constitutes the first nozzle has a cylindrical paszle, and the valve controlling the admission of steam to the third nozzle, which will, for dis.- tinction, be calledthe secondary 7 valve, as its operation depends on that of the valve controlling the admission of' steam to the first nozzle, which will be called the main7 7 valve, has a tubular projection passinginto the said passage at the base of the first nozzle, and having a longitudinal movement therein without ever being withdrawn from the said passage in the operation of the injector. A space or recess is provided between the base of the piece constituting the first nozzle and the connectingpiece between the steam-chamber-and the casting containing the water-chamber, which recess receives packing for the tubular projection of the secondary valve, the said packing being compressed in the operation of connecting the steam-chamber with they casting containing the water-chamber. The said connecting-piece is provided with a seat for an enlarged portion of the secondary valve, and contains passages leading from the space below the said seat and around the tubular projection of the secondary valvel and passage in which it operates into the ypassages around the water-chamber leading to the third nozzle, so'that when the secondary valve is unseated the steam flows around it to thethird nozzle. The secondary valve is provided'with a seat at the upper end of the tubular projection leading to the rst nozzle', and the Inain valve co-operates with the said seat to control the flow of steam through the said passage to the rst nozzle. The said main valve, after being Inoved a certain amount from its seat,

engages the secondary valve and unseats it,r

thus admitting steam to the third nozzlea short time after it has been admitted to the first nozzle, as is required for the proper operation ofthe injector.

ICO

Besides the features above mentioned, the

invention further consistsin various details of construction, which will be hereinafter pointed ou't. l

Figure 1 is a longitudinal section of an injeetor embodying this inveiitioii,showiiig both valves closed; Fig. 2, a similar section on a plane nearly at right angles to that of Fi 0. l, showing the valves both open andthe passages leading to the third nozzle; Figs. 3 and 4,trans verse sections on lines .r and y, respcctively,of Fig. l; Figi 5, a side elevation of the secondary valve detached.

lIhe injector comprises in its construction a casting, c, constituting the main portion of the steanrchainber, provided with a steaminlet passage, (it, and bonnet c, which constitutes a nut I'or the stein b, by which the valves are operated, a casting, c, or connecting piece, which receives a coupling-nut, el, a casting, e, connected with the one c and the steanrchanibei' by the said coupling-nut, and containing the second nozzle, c, water chamber c2, and water-inlet passage c, and passages c", (see Figs. 2 and 41,) around the said water-chamber, and a cast-ing or piece, f, connected with the piece c by a coupling-nut, 7', and containing the third nozzle7 /",the base or inout-h of which communicates through the passages c with the steam-chamber. The casting or connecting piece cis tightly fastened to the piece c by screw-threads or otherwise, the two connected pieces (t and c constituting the steam-clianiber and being made separately merely Vfor the purpose of applying the coupliiig-iiut (l, and, if desired, the said coiinectiiig-pieee and the various passages, seats, &c., formed therein might be niade iiitegial with the piece (l, being attached to the piece c by a scrcw-thiead, bolted ilange, or other suitable means, instead of employing the couplinglnut. The piece g, constituting the first nozzle, is connected with the piece c, preferably by screw-threads, and the tip of the said nozzle y projects only a short distance into the water-chamber, while the base of the second nozzle, c, extends back into the said chamber, as shown, so that the tip of the nozzle terminates within the length ofthe outer shell of the casting c, being thus protected from damage during the handling of the said casting before the injector is pnt togctlier. The piece or castingf forms a cylindrical chamber around the third nozzle,- f, and extends beyond the tip or orifice of the said nozzle, which is thus also protected from damage, the said chamber being piovided at its end with external and internal screw threads, the latter of which may receive a detachable discharge-tnbe, 7.1, having its month a short distance in advance of the orifice of the nozzle f', which constitutes the coinbiningeo1ie or delivery-nozzle ol' the injector, and may deliver the combined j et into the said chamber f before the `iet has acquired sufficient force to overcome the pressure which it is ultimately to overcome, the said cylinder or shell j' thus operating like the overflowchambersA commonly employed in injectors and constituting the main overflow'chainber ofthe injector. The external thread of the casting f may be employed to connect the injector with the piping leading to the boiler or other point where the liquid is to be delivered, being shown in Fig. 1 as having a nipple, m, connected with it by a coupling-iiiit, n.

By having the pipe connected with the eX- ternal thread of the casting j", as shown, and the dischargetube connected with an independent intcrnal thread, the said tube may be removed, if it is desired, to deliver directly from the nozzlef into the pipe, which cannot be done when the pipingis connected with the delivery-tiibe, which forms an intermediate member between the pipe and remainder of the in jcctor, as is usually the case.

The outer shell of the eastingf, consti( utiiig the main over[low-chamber, is provided with a lateral opening, f2, which receives an auxiliary overflow-chamber, p, consisting of a cast ing having a passage, p', leading :l'roin the iiiteiior of the casting j" and terminating in a valve seat, p2, inelosed in a vertical chamber, 12", extending above and below' the said valveseat and provided at its upper end with a cap, p, containing a guide, p5, :for the stein p of a valve, p7, eti-operating with. the said' seat y?. Thus when fluid is escaping from the nozzlcf into the oy'erfloiwcliamber it will pass out through the passage p, lifting the valve p7, and then ilowing down around the orifice of the passage p and escaping at the lower end of thcchainbci-p". The first nozzle, g, isprovided with a tubular extension, g', fitted within a suitably-recessed portion, c2, in the portion c of the steamchamber, the said extension g and portion c2 having a passage, f/i, into which is fitted a tubular extension, Il', ofthe secondary valve 71 which is free to move up and down in the said passage g. The tubular extension g does not wholly fill the recess of the portion c2, leaving a space therein to receive packing c, which may be placed around the tubular extension h before the steam-chamber is conneetcd with the piece c by the coiipliiig-iiut d, and when the rsaid pieces are draavn together by the said coupling nut the packing will be compressed tightly within said recess around the extension li', thus causing the latter to be steam-tight in the passage g". The poi tion c of the steam chamber is provided with passages c". (Shown in Figs. 2 and 3.) Around the recessed portion and base of the first nozzle and above the said passages, it has a seat, c, preferably convex, as shown, which co-operates with the main body of the secondary valve l1, so that the latter, when seated, as shown in Fig. il, prevents the passage of steam from the inlet c2 to the passages c", which communicate through the space around the first nozzle with the passages c' in the piece c leading to the third nozzle. rllie secondary valve lt is made hollow, steam being admitted to the interior thereof, and at the upper end of the tubular extension it has a seat for the inain valve t', connected or inade integral with the valve-stein Then the valve fi' is unseated, steam will immediately pass through the passage h to the iirst nozzle, and the said valve fi or the valve-stein b is IOO provided'with a shoulder or projection, which, after a deinite amount of movement of the said valve from its seat engages the secondary valve, lifting it from the seat c, as shown in Fig. 2, and permitting steam to pass through the passages c4 and e4 to the third nozzle, f. As shown in this instance, the main valve or shoulder of the Valve-stem engages a tubular nut, 7L", (see Fig. 5,) screwed into an annular collar, 72.5, connected with the main portion of the secondary valve by arms h, between which the steam is admitted to the interior of the secondary valve, and in order to prevent the said nut hf* from being unscrewed in the operation ot' the injector, its thread is of opposite hand or inclination to that of the valve-stem b, so that the friction between the shoulder of the said stem and the nut while the secondary valve is being raised from its seat by the main valve-stem turning in a direction to raise or unscrew it in the nut a tends to screw the nut 71,* more tightly into its socket. When the valve-stein is turned in the other direction to close the valve, the shoulder is immediately withdrawn from the said nut h", and consequently has no further tendency Vto turn the same or loosen it.

By making the passage g3 for the secondary valve partly in the first nozzle and partly in the casting c or steam-chamber, and placing the packing around the extension of the secondary valve instead of embedding it within a groove in the said extension, a.V much tighter and more durable joint is afforded and the operation of the injector is improved. The bridges cs, which connect the recessed portion c2, that receives the extension 11.', and rear end ofthe iirst nozzle with the outer .shell of the said casting, enable the latter to be engaged by a tool and screwed tightly into the casting a after the ring d has been applied, so that the said pieces a and c constitute practically a single piece, remaining permanently connected together and constituting the steam-chamber or portion which supplies the steam to thein-V jector-proper, all the parts of which are connected with the piece e, and may be removed from the said steam-chamber by unscrewing the coupling nut or ring d, when the said chamber will constitute a valve controlling the escape of steam from the inletpassage a?, shutting off the steam when both valves are seated, so that no other valve is required in the steam-pipe connected with the inlet-passage a2. 4

I claim- 1. An injector having three nozzles and a steam-chamber, the iirst nozzle being provided with a passage, and the steam-chamber having a passage forming a continuation thereof, and other passages leading to the third nozzle, and a seat above the said passages combined with a secondary valve eo-operating with the said seat, and having a tubular extension working in the passage of the first nozzle and its continuation, and a main valve controlling the iiow of steam through the said tubular extension and operating to move the secondary valve with relation to its seat, substantially as described.

2. An injector having three nozzles and a steam chamber having an internal recessed portieri and passages around the same, the first nozzle having an extension entering the said recessed portion, combined with a secondary valve having a tubular extension entering a passage formed partly in the recessed portion of the steam-chamber and partly in the first nozzle,and packing compressed around the said extension between the first nozzle and recessed portion of the steam-chamber, and

the main valve controlling the iiow of steam through the tubular extension of the secondary valve and operating the said secondary valve, substantially as described.

3. An injector having three nozzles, the first and third for the actuating-fluid and the second receiving the liquid to be forced, the said injector having a casting containing a water chamber and having the second nozzle made integral therewith, the base of the said nozzle extending into the water-chamber, and the said casting having an outer shell surrounding the said water-chamber and second nozzle, which latter terminates within the length of the said shell, substantially as and for the purpose described.

et. In an injector having three nozzles, a secondary valve controlling the flow 'of the actuating-fluid to the third or foremost of said nozzles,and a main valve having a threaded stem controlling the flow of fluid to the iirst or rearmost of said nozzles,combined with a nut connected with the secondary valve encircling the valve-stem, 'and adapted to be 'engaged by a shoulder thereon, the said nut having a thread of opposite hand or inclina` tion to that of the valve-stem, whereby the rotation of the latter when the shoulder is engaged with the said nut tends to turn the latter into its socket, substantially as described.

5. In an injector, the combination of an overflow-chamber or shell surrounding the mouth of the discharge-tube of the injector,

with an auxiliary overflow-chamber.attached to the said shell,provided with a passage leading from the said shell and terminating in a ,valve-seat, and a chamber surrounding said valve-seat and extending above and below the same, and a cap inclosing the upper end of r2o` IIO the said chamber and provided with a guide,

anda valve having a stem operating in the said guide, the liquid passing the said valve escaping at the lower end of the said outer chamber, substantially as described.

In ltestimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WM. T. MESSINGER.

Vitnesses:

Jos. P. LIVERMORE, H. P. BATES. 

